Feat(snowflake): translate [CHAR|NCHAR] VARYING into VARCHAR (#1634)

sqlglot/dialects/snowflake.py

@@ -263,17 +263,19 @@ class Tokenizer(tokens.Tokenizer):
 
         KEYWORDS = {
             **tokens.Tokenizer.KEYWORDS,
+            "CHAR VARYING": TokenType.VARCHAR,
+            "NCHAR VARYING": TokenType.VARCHAR,
             "EXCLUDE": TokenType.EXCEPT,
             "ILIKE ANY": TokenType.ILIKE_ANY,
             "LIKE ANY": TokenType.LIKE_ANY,
             "MATCH_RECOGNIZE": TokenType.MATCH_RECOGNIZE,
+            "MINUS": TokenType.EXCEPT,
             "PUT": TokenType.COMMAND,
             "RENAME": TokenType.REPLACE,
             "TIMESTAMP_LTZ": TokenType.TIMESTAMPLTZ,
             "TIMESTAMP_NTZ": TokenType.TIMESTAMP,
             "TIMESTAMP_TZ": TokenType.TIMESTAMPTZ,
             "TIMESTAMPNTZ": TokenType.TIMESTAMP,
-            "MINUS": TokenType.EXCEPT,
             "SAMPLE": TokenType.TABLE_SAMPLE,
         }
 

tests/dialects/test_snowflake.py

@@ -27,6 +27,8 @@ def test_snowflake(self):
         self.validate_identity("COMMENT IF EXISTS ON TABLE foo IS 'bar'")
         self.validate_identity("SELECT CONVERT_TIMEZONE('UTC', 'America/Los_Angeles', col)")
 
+        self.validate_all("CAST(x AS CHAR VARYING)", write={"snowflake": "CAST(x AS VARCHAR)"})
+        self.validate_all("CAST(x AS NCHAR VARYING)", write={"snowflake": "CAST(x AS VARCHAR)"})
         self.validate_all(
             "SELECT i, p, o FROM qt QUALIFY ROW_NUMBER() OVER (PARTITION BY p ORDER BY o) = 1",
             write={